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ffmpeg/libavutil/hdr_dynamic_metadata.c

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/**
* Copyright (c) 2018 Mohammad Izadi <moh.izadi at gmail.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avassert.h"
#include "hdr_dynamic_metadata.h"
#include "mem.h"
#include "libavcodec/defs.h"
#include "libavcodec/get_bits.h"
#include "libavcodec/put_bits.h"
static const int64_t luminance_den = 1;
static const int32_t peak_luminance_den = 15;
static const int64_t rgb_den = 100000;
static const int32_t fraction_pixel_den = 1000;
static const int32_t knee_point_den = 4095;
static const int32_t bezier_anchor_den = 1023;
static const int32_t saturation_weight_den = 8;
AVDynamicHDRPlus *av_dynamic_hdr_plus_alloc(size_t *size)
{
AVDynamicHDRPlus *hdr_plus = av_mallocz(sizeof(AVDynamicHDRPlus));
if (!hdr_plus)
return NULL;
if (size)
*size = sizeof(*hdr_plus);
return hdr_plus;
}
AVDynamicHDRPlus *av_dynamic_hdr_plus_create_side_data(AVFrame *frame)
{
AVFrameSideData *side_data = av_frame_new_side_data(frame,
AV_FRAME_DATA_DYNAMIC_HDR_PLUS,
sizeof(AVDynamicHDRPlus));
if (!side_data)
return NULL;
memset(side_data->data, 0, sizeof(AVDynamicHDRPlus));
return (AVDynamicHDRPlus *)side_data->data;
}
int av_dynamic_hdr_plus_from_t35(AVDynamicHDRPlus *s, const uint8_t *data,
size_t size)
{
uint8_t padded_buf[AV_HDR_PLUS_MAX_PAYLOAD_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
GetBitContext gbc, *gb = &gbc;
int ret;
if (!s)
return AVERROR(ENOMEM);
if (size > AV_HDR_PLUS_MAX_PAYLOAD_SIZE)
return AVERROR(EINVAL);
memcpy(padded_buf, data, size);
// Zero-initialize the buffer padding to avoid overreads into uninitialized data.
memset(padded_buf + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
ret = init_get_bits8(gb, padded_buf, size);
if (ret < 0)
return ret;
if (get_bits_left(gb) < 10)
return AVERROR_INVALIDDATA;
s->application_version = get_bits(gb, 8);
s->num_windows = get_bits(gb, 2);
if (s->num_windows < 1 || s->num_windows > 3) {
return AVERROR_INVALIDDATA;
}
if (get_bits_left(gb) < ((19 * 8 + 1) * (s->num_windows - 1)))
return AVERROR_INVALIDDATA;
for (int w = 1; w < s->num_windows; w++) {
// The corners are set to absolute coordinates here. They should be
// converted to the relative coordinates (in [0, 1]) in the decoder.
AVHDRPlusColorTransformParams *params = &s->params[w];
params->window_upper_left_corner_x =
(AVRational){get_bits(gb, 16), 1};
params->window_upper_left_corner_y =
(AVRational){get_bits(gb, 16), 1};
params->window_lower_right_corner_x =
(AVRational){get_bits(gb, 16), 1};
params->window_lower_right_corner_y =
(AVRational){get_bits(gb, 16), 1};
params->center_of_ellipse_x = get_bits(gb, 16);
params->center_of_ellipse_y = get_bits(gb, 16);
params->rotation_angle = get_bits(gb, 8);
params->semimajor_axis_internal_ellipse = get_bits(gb, 16);
params->semimajor_axis_external_ellipse = get_bits(gb, 16);
params->semiminor_axis_external_ellipse = get_bits(gb, 16);
params->overlap_process_option = get_bits1(gb);
}
if (get_bits_left(gb) < 28)
return AVERROR_INVALIDDATA;
s->targeted_system_display_maximum_luminance =
(AVRational){get_bits_long(gb, 27), luminance_den};
s->targeted_system_display_actual_peak_luminance_flag = get_bits1(gb);
if (s->targeted_system_display_actual_peak_luminance_flag) {
int rows, cols;
if (get_bits_left(gb) < 10)
return AVERROR_INVALIDDATA;
rows = get_bits(gb, 5);
cols = get_bits(gb, 5);
if (((rows < 2) || (rows > 25)) || ((cols < 2) || (cols > 25))) {
return AVERROR_INVALIDDATA;
}
s->num_rows_targeted_system_display_actual_peak_luminance = rows;
s->num_cols_targeted_system_display_actual_peak_luminance = cols;
if (get_bits_left(gb) < (rows * cols * 4))
return AVERROR_INVALIDDATA;
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
s->targeted_system_display_actual_peak_luminance[i][j] =
(AVRational){get_bits(gb, 4), peak_luminance_den};
}
}
}
for (int w = 0; w < s->num_windows; w++) {
AVHDRPlusColorTransformParams *params = &s->params[w];
if (get_bits_left(gb) < (3 * 17 + 17 + 4))
return AVERROR_INVALIDDATA;
for (int i = 0; i < 3; i++) {
params->maxscl[i] =
(AVRational){get_bits(gb, 17), rgb_den};
}
params->average_maxrgb =
(AVRational){get_bits(gb, 17), rgb_den};
params->num_distribution_maxrgb_percentiles = get_bits(gb, 4);
if (get_bits_left(gb) <
(params->num_distribution_maxrgb_percentiles * 24))
return AVERROR_INVALIDDATA;
for (int i = 0; i < params->num_distribution_maxrgb_percentiles; i++) {
params->distribution_maxrgb[i].percentage = get_bits(gb, 7);
params->distribution_maxrgb[i].percentile =
(AVRational){get_bits(gb, 17), rgb_den};
}
if (get_bits_left(gb) < 10)
return AVERROR_INVALIDDATA;
params->fraction_bright_pixels = (AVRational){get_bits(gb, 10), fraction_pixel_den};
}
if (get_bits_left(gb) < 1)
return AVERROR_INVALIDDATA;
s->mastering_display_actual_peak_luminance_flag = get_bits1(gb);
if (s->mastering_display_actual_peak_luminance_flag) {
int rows, cols;
if (get_bits_left(gb) < 10)
return AVERROR_INVALIDDATA;
rows = get_bits(gb, 5);
cols = get_bits(gb, 5);
if (((rows < 2) || (rows > 25)) || ((cols < 2) || (cols > 25))) {
return AVERROR_INVALIDDATA;
}
s->num_rows_mastering_display_actual_peak_luminance = rows;
s->num_cols_mastering_display_actual_peak_luminance = cols;
if (get_bits_left(gb) < (rows * cols * 4))
return AVERROR_INVALIDDATA;
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
s->mastering_display_actual_peak_luminance[i][j] =
(AVRational){get_bits(gb, 4), peak_luminance_den};
}
}
}
for (int w = 0; w < s->num_windows; w++) {
AVHDRPlusColorTransformParams *params = &s->params[w];
if (get_bits_left(gb) < 1)
return AVERROR_INVALIDDATA;
params->tone_mapping_flag = get_bits1(gb);
if (params->tone_mapping_flag) {
if (get_bits_left(gb) < 28)
return AVERROR_INVALIDDATA;
params->knee_point_x =
(AVRational){get_bits(gb, 12), knee_point_den};
params->knee_point_y =
(AVRational){get_bits(gb, 12), knee_point_den};
params->num_bezier_curve_anchors = get_bits(gb, 4);
if (get_bits_left(gb) < (params->num_bezier_curve_anchors * 10))
return AVERROR_INVALIDDATA;
for (int i = 0; i < params->num_bezier_curve_anchors; i++) {
params->bezier_curve_anchors[i] =
(AVRational){get_bits(gb, 10), bezier_anchor_den};
}
}
if (get_bits_left(gb) < 1)
return AVERROR_INVALIDDATA;
params->color_saturation_mapping_flag = get_bits1(gb);
if (params->color_saturation_mapping_flag) {
if (get_bits_left(gb) < 6)
return AVERROR_INVALIDDATA;
params->color_saturation_weight =
(AVRational){get_bits(gb, 6), saturation_weight_den};
}
}
return 0;
}
int av_dynamic_hdr_plus_to_t35(const AVDynamicHDRPlus *s, uint8_t **data, size_t *size)
{
uint8_t *buf;
size_t size_bits, size_bytes;
PutBitContext pbc, *pb = &pbc;
if (!s)
return AVERROR(EINVAL);
if ((!data || *data) && !size)
return AVERROR(EINVAL);
/**
* Buffer size per CTA-861-H p.253-254:
* 48 header bits (excluded from the serialized payload)
* 8 bits for application_mode
* 2 bits for num_windows
* 153 bits for window geometry, for each window above 1
* 27 bits for targeted_system_display_maximum_luminance
* 1-2511 bits for targeted system display peak luminance information
* 82-442 bits per window for pixel distribution information
* 1-2511 bits for mastering display peak luminance information
* 1-179 bits per window for tonemapping information
* 1-7 bits per window for color saturation mapping information
* Total: 123-7249 bits, excluding trimmed header bits
*/
size_bits = 8;
size_bits += 2;
for (int w = 1; w < s->num_windows; w++)
size_bits += 153;
size_bits += 27;
size_bits += 1;
if (s->targeted_system_display_actual_peak_luminance_flag)
size_bits += 10 +
s->num_rows_targeted_system_display_actual_peak_luminance *
s->num_cols_targeted_system_display_actual_peak_luminance * 4;
for (int w = 0; w < s->num_windows; w++)
size_bits += 72 + s->params[w].num_distribution_maxrgb_percentiles * 24 + 10;
size_bits += 1;
if (s->mastering_display_actual_peak_luminance_flag)
size_bits += 10 +
s->num_rows_mastering_display_actual_peak_luminance *
s->num_cols_mastering_display_actual_peak_luminance * 4;
for (int w = 0; w < s->num_windows; w++) {
size_bits += 1;
if (s->params[w].tone_mapping_flag)
size_bits += 28 + s->params[w].num_bezier_curve_anchors * 10;
size_bits += 1;
if (s->params[w].color_saturation_mapping_flag)
size_bits += 6;
}
size_bytes = (size_bits + 7) / 8;
av_assert0(size_bytes <= AV_HDR_PLUS_MAX_PAYLOAD_SIZE);
if (!data) {
*size = size_bytes;
return 0;
} else if (*data) {
if (*size < size_bytes)
return AVERROR_BUFFER_TOO_SMALL;
buf = *data;
} else {
buf = av_malloc(size_bytes);
if (!buf)
return AVERROR(ENOMEM);
}
init_put_bits(pb, buf, size_bytes);
// application_mode is set to Application Version 1
put_bits(pb, 8, 1);
// Payload as per CTA-861-H p.253-254
put_bits(pb, 2, s->num_windows);
for (int w = 1; w < s->num_windows; w++) {
put_bits(pb, 16, s->params[w].window_upper_left_corner_x.num / s->params[w].window_upper_left_corner_x.den);
put_bits(pb, 16, s->params[w].window_upper_left_corner_y.num / s->params[w].window_upper_left_corner_y.den);
put_bits(pb, 16, s->params[w].window_lower_right_corner_x.num / s->params[w].window_lower_right_corner_x.den);
put_bits(pb, 16, s->params[w].window_lower_right_corner_y.num / s->params[w].window_lower_right_corner_y.den);
put_bits(pb, 16, s->params[w].center_of_ellipse_x);
put_bits(pb, 16, s->params[w].center_of_ellipse_y);
put_bits(pb, 8, s->params[w].rotation_angle);
put_bits(pb, 16, s->params[w].semimajor_axis_internal_ellipse);
put_bits(pb, 16, s->params[w].semimajor_axis_external_ellipse);
put_bits(pb, 16, s->params[w].semiminor_axis_external_ellipse);
put_bits(pb, 1, s->params[w].overlap_process_option);
}
put_bits(pb, 27, s->targeted_system_display_maximum_luminance.num * luminance_den /
s->targeted_system_display_maximum_luminance.den);
put_bits(pb, 1, s->targeted_system_display_actual_peak_luminance_flag);
if (s->targeted_system_display_actual_peak_luminance_flag) {
put_bits(pb, 5, s->num_rows_targeted_system_display_actual_peak_luminance);
put_bits(pb, 5, s->num_cols_targeted_system_display_actual_peak_luminance);
for (int i = 0; i < s->num_rows_targeted_system_display_actual_peak_luminance; i++) {
for (int j = 0; j < s->num_cols_targeted_system_display_actual_peak_luminance; j++)
put_bits(pb, 4, s->targeted_system_display_actual_peak_luminance[i][j].num * peak_luminance_den /
s->targeted_system_display_actual_peak_luminance[i][j].den);
}
}
for (int w = 0; w < s->num_windows; w++) {
for (int i = 0; i < 3; i++)
put_bits(pb, 17, s->params[w].maxscl[i].num * rgb_den / s->params[w].maxscl[i].den);
put_bits(pb, 17, s->params[w].average_maxrgb.num * rgb_den / s->params[w].average_maxrgb.den);
put_bits(pb, 4, s->params[w].num_distribution_maxrgb_percentiles);
for (int i = 0; i < s->params[w].num_distribution_maxrgb_percentiles; i++) {
put_bits(pb, 7, s->params[w].distribution_maxrgb[i].percentage);
put_bits(pb, 17, s->params[w].distribution_maxrgb[i].percentile.num * rgb_den /
s->params[w].distribution_maxrgb[i].percentile.den);
}
put_bits(pb, 10, s->params[w].fraction_bright_pixels.num * fraction_pixel_den /
s->params[w].fraction_bright_pixels.den);
}
put_bits(pb, 1, s->mastering_display_actual_peak_luminance_flag);
if (s->mastering_display_actual_peak_luminance_flag) {
put_bits(pb, 5, s->num_rows_mastering_display_actual_peak_luminance);
put_bits(pb, 5, s->num_cols_mastering_display_actual_peak_luminance);
for (int i = 0; i < s->num_rows_mastering_display_actual_peak_luminance; i++) {
for (int j = 0; j < s->num_cols_mastering_display_actual_peak_luminance; j++)
put_bits(pb, 4, s->mastering_display_actual_peak_luminance[i][j].num * peak_luminance_den /
s->mastering_display_actual_peak_luminance[i][j].den);
}
}
for (int w = 0; w < s->num_windows; w++) {
put_bits(pb, 1, s->params[w].tone_mapping_flag);
if (s->params[w].tone_mapping_flag) {
put_bits(pb, 12, s->params[w].knee_point_x.num * knee_point_den / s->params[w].knee_point_x.den);
put_bits(pb, 12, s->params[w].knee_point_y.num * knee_point_den / s->params[w].knee_point_y.den);
put_bits(pb, 4, s->params[w].num_bezier_curve_anchors);
for (int i = 0; i < s->params[w].num_bezier_curve_anchors; i++)
put_bits(pb, 10, s->params[w].bezier_curve_anchors[i].num * bezier_anchor_den /
s->params[w].bezier_curve_anchors[i].den);
put_bits(pb, 1, s->params[w].color_saturation_mapping_flag);
if (s->params[w].color_saturation_mapping_flag)
put_bits(pb, 6, s->params[w].color_saturation_weight.num * saturation_weight_den /
s->params[w].color_saturation_weight.den);
}
}
flush_put_bits(pb);
*data = buf;
if (size)
*size = size_bytes;
return 0;
}
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